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Vaginal infections are a very common cause for the pH of the vagina to rise. The most common vaginal infection in my practice (and in all doctor's offices) is Bacterial Vaginosis which causes the normal vaginal pH to rise to above 4.5. Odor usually occurs with Bacterial Vaginosis.
Missing data is unknown at this time. Because the pH scale is logarithmic, a one unit change in pH is associated with a 10 fold change in the acidity. For example, lemon juice has a pH of 2.0, while grapefruit juice has a pH of 3.0. Lemon juice would therefore be 10x as acidic as grapefruit juice.